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Question

Consider the potentiometer circuit shown in the figure below. The potentiometer wire is 600 cm long. At what distance from point A should the jockey be placed to get zero deflection in the galvanometer?


A

320 cm

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B

500 cm

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C

250 cm

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D

430 cm

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Solution

The correct option is A

320 cm


For zero deflection of the galvanometer, no current will flow in the secondary circuit.
Current through the potentiometer wire, I=Er+15r=E16r
Suppose the distance from end A where the jockey is placed be x cm. The drop across this length of potentiometer wire will be E2.
E2=I×x600×15rE2=E16r×x600×15rx=320 cm


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